Filling mining method based on stage reverse medium-length hole groove broaching

Abstract

The invention discloses a filling mining method based on stage reverse medium-length hole groove broaching, which relates to the technical field of mining, and comprises the following steps: stope structure parameter design, mining preparation engineering construction, cutting engineering, stoping process and filling process are carried out in sequence, the cutting project comprises the steps of cutting courtyard rapid forming, cutting groove broaching and cutting groove rapid penetrating; and the cutting courtyard is rapidly formed by adopting a laser pre-splitting auxiliary blasting process. According to the method, the cutting and groove broaching processes are deeply optimized, so that the overall efficiency of underground mining is remarkably improved. In the cutting courtyard forming stage, the laser presplitting auxiliary blasting technology is introduced, so that the rock integrity is reduced, the blasting energy is more concentrated, the effect is more accurate, the problems of perforation, rock slag squeezing and the like in the traditional process are effectively avoided, the explosive loading amount can be reduced, disturbance of blasting vibration to surrounding rock is reduced, and the blasting quality is improved. And a safer technical support is provided for high-stress ore body mining.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mine exploitation, in particular to a filling mining method based on stage reverse medium-length hole slotting. BACKGROUND

[0002] In the field of underground mining of underground mines, the sublevel drilling and stage mining method is widely used in various metal mines due to its ability to adapt to medium-thick to thick ore bodies and achieve safe and efficient mining. One of the core links of this method is to form a through cutting slot at the end of the stope, which provides the necessary free surface and compensation space for subsequent large-scale blasting and ore removal. The formation efficiency and quality directly determine the recovery progress and production benefit of the whole stope. However, there are many technical bottlenecks in the process of forming the cutting slot by traditional technology: the cutting shaft, as the initial compensation space for slotting, is often constructed by ordinary medium-length hole blasting in several stages, which not only has a long well-forming period, but also has problems such as "stuck drill" and "rock slag blockage" caused by improper matching of hole network parameters in hard rock conditions, making it difficult to quickly form a regular shaft structure; in the slotting stage of the cutting slot, due to uneven distribution of blasting energy and uncontrollable rock fracture direction, the free surface formed is often irregular in shape, leading to chaotic distribution of ore block size in subsequent blasting, increasing the workload of secondary crushing and ore removal difficulty.

[0003] With the extension of mining to deep parts and the increase of the proportion of complex ore bodies, the limitations of traditional cutting and slotting technology are further highlighted. In high stress geological conditions, traditional blasting is prone to excessive vibration of surrounding rock, inducing rock burst and other safety hazards; for non-standard ore bodies such as thin ore bodies and gently inclined ore bodies, the fixed parameter slotting scheme is difficult to adapt to the shape of the ore body, often resulting in mismatch between the cutting slot and the ore body boundary, reducing resource recovery rate, etc. At the same time, the judgment of the height of the stored ore during the process of cutting slot penetration relies on manual experience and lacks precise monitoring means, which may lead to insufficient compensation space or excessive ore removal due to improper control of the amount of ore removed, affecting the effect of subsequent blasting. These problems together lead to an extension of the stope preparation period and a limitation of production efficiency, making it difficult to meet the needs of modern mining scale and intensive mining, and it is urgent to upgrade the cutting and slotting technology through technological innovation to achieve efficiency, precision and intelligence.

[0004] There is no effective solution to the problems in the related art. SUMMARY

[0005] To solve the problems in the related art, the present application proposes a filling mining method based on stage reverse medium-length hole slotting to overcome the low efficiency of cutting shaft formation, poor control of cutting slot profile, insufficient adaptability to complex geology, and lack of parameter quantization in the prior art, which is suitable for mining of ore bodies under complex conditions such as steeply inclined, gently inclined, thin ore bodies and high stress.

[0006] The technical scheme of the present application is implemented as follows:

[0007] A filling mining method based on stage reverse medium-length hole slotting, comprising the following steps: sequentially performing stope structure parameter design, preparation engineering construction, cutting engineering, stoping process and filling process, wherein,

[0008] The cutting engineering comprises: cutting shaft rapid formation, cutting slot slotting and cutting slot rapid penetration.

[0009] The cutting shaft rapid formation adopts a laser pre-splitting auxiliary blasting process.

[0010] The cutting slot slotting adopts a directional fracture blasting process.

[0011] The cutting slot rapid penetration adopts three-dimensional laser scanning monitoring of the height of the slot ore.

[0012] Further, the stope structure parameter design comprises: a stope width of 18-22m, a stage height of 100m, a segmented height of 25m; and a calibrated thickness of 5-10m thin ore body, a stope width adjustment of 12-15m; a calibrated dip angle of 30°-50° gentle inclined ore body, and an angle between the long axis of the stope and the ore body strike set to 45°.

[0013] Further, the preparation engineering construction comprises: arranging 10-15 laser reflection targets at a height of 1.5m around each horizontal cutting lane, with a reflection target spacing of 5m, and using anchor rods for fixation and a buried depth of ≥300mm.

[0014] Further, the cutting shaft rapid formation comprises the following steps:

[0015] A vertical large hole with a diameter of 670mm and a depth of 25m is constructed, and the hole opening and hole bottom are protected by anchor rods and metal nets.

[0016] Five rows of a total of 24 expansion holes with a diameter of 80mm are constructed around the large hole, with a hole spacing of 0.7m and a row spacing of 0.8m.

[0017] A 1064nm pulse laser is used to pre-split the rock mass between the expansion holes, with a scanning speed of 3-8m / min.

[0018] The expansion holes are subjected to charging and blasting, with a slotting hole charge of 1.2kg / m, an auxiliary hole charge of 1.0kg / m, and a peripheral hole charge of 0.8kg / m, and a millisecond blasting technique is used.

[0019] Further, the cutting slot slotting comprises the following steps:

[0020] Eleven rows of upward fan-shaped medium-length holes are arranged in the cutting cross lane, with a blast row spacing of 1.5m and a hole bottom distance of 0.8m.

[0021] A PVC shaped charge tube with a diameter of 75 mm is arranged in the blast hole, the wall thickness of the shaped charge tube is 5 mm, and the shaped charge groove angle is 60-70 degrees.

[0022] The gap between the shaped charge tube and the hole wall is filled with quartz sand with a diameter of 5 mm, and the filling rate is 100%.

[0023] The blasting is performed in the order of taking the first 1-3 rows as small cutting and the last 4-11 rows as large cutting, and the single-row initiation time difference is 200 ms.

[0024] Further, the cutting groove is quickly penetrated, including the following steps:

[0025] A three-dimensional laser scanner is used to scan the third layer cutting groove within 1 hour after blasting, and the point cloud density is 100 points / mm 2 ;

[0026] The dust within a range of 0.5 m around the reflective target is cleaned before scanning, and the scanning data is processed by Cyclone software, and the noise points with a confidence level of less than 95% are filtered;

[0027] When the height difference between the top surface of the ore pile and the second layer bottom plate is less than or equal to 0.1 m, the fourth layer of ore drawing is stopped;

[0028] The full cutting groove penetration time is less than or equal to 5 days.

[0029] Further, the stoping process includes taking the cutting groove as a free surface to perform lateral caving, the caving step distance is 2 m, and 1 / 3 of the ore is reserved as temporary support.

[0030] Further, the filling process includes: using tailings building waste cementing material, the tailings proportion is 30%, step-by-step filling and the first step filling is 8 m high, after initial setting for 48 hours, continue filling until the ore block is filled, and the final strength of the filling body is greater than or equal to 3 MPa.

[0031] The beneficial effects of the present application are:

[0032] 1、The present application significantly improves the overall efficiency of underground mining by optimizing the cutting and slotting process. In the cutting shaft forming stage, the introduction of laser pre-splitting assisted blasting technology not only reduces the integrity of the rock, makes the blasting energy more concentrated and accurate, effectively avoids the problems of "perforation" and "rock slag squeezing" in traditional process, but also reduces the charge quantity and the disturbance of blasting vibration to surrounding rock, providing safer technical support for high stress ore body mining. The combination of directional fracture blasting and shaped charge tube ensures the regularity of the free surface of the cutting slot, making the rock breaking direction controllable in subsequent blasting, greatly reducing the secondary crushing workload, and improving the uniformity of ore lump size, creating favorable conditions for efficient ore mining. The application of three-dimensional laser scanning technology realizes the accurate monitoring of the height of the storage groove ore, replacing the traditional manual experience judgment, avoiding the fluctuation of blasting effect caused by improper compensation space control, and ensuring the stability and efficiency of the cutting slot penetration process.

[0033] 2、The present application can well adapt to different types of ore bodies and complex geological conditions. For non-standard ore bodies such as thin ore bodies and gently inclined ore bodies, by dynamically adjusting the stope structure parameters and slot hole network parameters, the cutting slot and the shape of the ore body can be accurately matched, which helps to improve the resource recovery rate; in complex geological areas such as faults and aquifers, through pre-reinforcement, advanced treatment and other supporting measures, the construction risk can be effectively reduced to ensure the continuity of the process. At the same time, the whole process system reduces the dependence on manual high-risk operations, improves the underground operation environment through intelligent monitoring and automatic equipment cooperation, and reduces the labor intensity. In addition, the resource utilization of tailings and other solid wastes in the filling process not only reduces waste emissions, but also reduces the cost of filling materials, realizes the unity of economic benefits and environmental benefits, and provides strong support for the sustainable development of mines. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed in the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0035] Figure 1 is a flowchart of a filling mining method based on stage reverse medium-length hole slotting according to an embodiment of the present application. DETAILED DESCRIPTION

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the scope of protection of the present invention.

[0037] According to an embodiment of the present invention, a backfilling mining method based on staged reverse deep hole slotting is provided.

[0038] like Figure 1 As shown, the backfilling mining method based on staged reverse deep hole slotting according to an embodiment of the present invention includes the following steps:

[0039] Step S1: Pre-determine the stope structure parameters, including the stope's vertical alignment with the ore body strike, width 18-22m, stage height 100m, segment height 25m, with the upper three layers being the drilling level and the lowest layer being the concentrated ore extraction level. For thin ore bodies, 5-10m thick, the stope width is reduced to 12-15m; for gently dipping ore bodies, with a dip angle of 30°-50°, the angle between the stope's long axis and the ore body strike is adjusted to 45°.

[0040] Step S2 involves the construction of the mining preparation project, including conventional engineering such as the construction of the ore-exit level vein roadway and the rock drilling roadway. Simultaneously, a three-dimensional scanning benchmark is set up: 10-15 laser reflective targets are set up at a height of 1.5m around each horizontal cutting roadway, with a spacing of 5m and a target center error of ≤2mm. The reflective targets are fixed with anchor bolts with a burial depth of ≥300mm.

[0041] Step S3 involves the cutting process, which includes the following steps:

[0042] Step S301 involves a rapid forming process for the cut-out atrium, including the following steps:

[0043] Construct a large vertical borehole with a diameter of 670mm and a depth of 25m. The borehole opening and bottom are protected with Φ16mm anchor bolts and metal mesh. The anchor bolt spacing is 300mm, and the metal mesh is 100×100mm.

[0044] The well was enlarged by drilling 24 holes with a diameter of 80mm in 5 rows around the perimeter. The hole spacing was 0.7m, the row spacing was 0.8m, and the hole depth was 25m.

[0045] Laser pre-fracture treatment was performed using a 1064nm pulsed laser, scanning and pre-fractured between enlarged boreholes, as detailed below:

[0046] Hard rock, indicating uniaxial compressive strength > 80MPa, using a power of 3000W, scanning speed of 3m / min, spot diameter of 5mm, action time of 10s / point, and pre-crack depth of 80mm;

[0047] Medium-hard rock, indicating 40-80 MPa, using power 2500W, scanning speed 5m / min, spot diameter 4mm, action time 8s / point, pre-crack depth 60mm;

[0048] Soft rock, indicating <40 MPa, using power 2000W, scanning speed 8m / min, spot diameter 3mm, action time 5s / point, pre-crack depth 50mm;

[0049] Wherein, the interval between laser scanning and drilling construction is ≤24 hours to avoid pre-crack closure.

[0050] Carry out charging blasting, the charging amount of the cut hole is 1.2kg / m, the charging amount of the auxiliary hole is 1.0kg / m, the charging amount of the peripheral hole is 0.8kg / m, the full hole is coupled, and the filling length is ≥0.5m;

[0051] Wherein, MS1-MS3 detonator is used for the cut hole / auxiliary hole, 3 holes / section, and the millisecond is 50ms, MS10-MS15 detonator is used for the peripheral hole, 3-5 holes / section, and the millisecond is 500ms or more.

[0052] Step S302, cut slot and slotting process is carried out, including the following steps:

[0053] Carry out blast hole arrangement, 11 rows of upward fan-shaped medium-length holes are arranged in the cut lateral lane, the blast hole spacing is 1.5m, and the hole bottom distance is 0.8m;

[0054] Carry out shaped charge tube installation, Φ75mm PVC shaped charge tube is used, the shaped charge slot angle is 60°, and the slot opening direction is towards the free surface direction; the gap between the shaped charge tube and the hole wall is filled with Φ5mm quartz sand, and the filling rate is 100%;

[0055] Calibrate the blasting sequence, including blasting 1-3 rows (small cutting) first, and then blasting 4-11 rows (large cutting), the single row initiation time difference is 200ms, and the rock is ensured to be broken along the shaped charge direction.

[0056] Step S303, cut slot and rapid breakthrough process is carried out, including the following steps:

[0057] Pre-use Z+FIMAGER5010X three-dimensional laser scanner, clean the dust within the range of 0.5m around the reflection target before scanning;

[0058] Carry out data processing, complete scanning within 1 hour after blasting, filter noise points by using Cyclone software, generate a three-dimensional model and calculate the height difference between the top surface of the stockpile and the bottom plate of the second layer;

[0059] Carry out breakthrough control, when the height difference is ≤0.1m, stop the fourth layer of mining and mining; when blasting the second layer 4-11 rows, use the ore loading operation or the charging trolley;

[0060] Step forming is performed, and the positive row blasting adopts directional fracturing technology, and the step slope angle error is less than or equal to 3°, and the final cutting groove penetration time is less than or equal to 5 days.

[0061] Step S4, the stoping and filling process is performed, 1 / 3 ore is reserved as temporary support during lateral caving, the caving step distance is 2m, tailings construction waste cementing material is used, the tailings proportion is 30%, the first step filling is 8m high, 1:10 ratio is used, after initial setting for 48 hours, continue filling, and stop when the strength is greater than or equal to 3MPa.

[0062] In addition, in application, for complex geology, such as fault zone, cutting shaft can be used to avoid faults above 3m, when encountering faults, the laser pre-splitting power is increased by 20%, and advanced grouting (cement, water glass ratio 1:1) is used for reinforcement; for high stress ore body, Φ20mm anchor rod (interval row distance 800*800mm) is used for pre-reinforcement within a range of 5m around the cutting lane, and blasting is completed within 24 hours after laser pre-splitting; for aquifer, advanced water exploration holes are constructed, one every 5m, and when the water inflow is greater than 5m 3 / h, pipe drainage is used.

[0063] By means of the above technical scheme, a large iron mine is selected, the average thickness of the ore body is 15m, the inclination angle is 65°, it belongs to steeply inclined medium-thick ore body, the ore rock is granite, the uniaxial compressive strength is 85MPa, it belongs to hard rock, when the traditional sublevel drilling and stage ore removal and subsequent filling mining method is used, there are problems of long cutting groove penetration period of up to 28 days, low blasting efficiency, high secondary crushing rate and the like, after the application of the present application technology, the various indexes are significantly improved, and the specific implementation process is as follows:

[0064] The stope structure parameters are designed in advance, the stope is arranged vertically to the ore body strike, the width is 20m (matching the ore body thickness of 15m), the stage height is 100m, and it is divided into 4 sublevels (25m / sublevel), wherein the 1st to 3rd sublevels are drilling levels, and the 4th sublevel is a concentrated ore removal level. The cutting groove is arranged at the end of the stope, which is 10m away from the lower boundary of the ore body, and the cutting crossheading length is 12m.

[0065] The development engineering construction is performed, including that the ore removal level is connected with the auxiliary ramp at a distance of 20m from the lower boundary of the ore body, and the ore removal access is connected with the ore removal crossheading at an angle of 45°. The drilling level is arranged outside the vein along the vein roadway, and the drilling roadway is perpendicular to the ore body strike with a spacing of 20m. At the same time, the three-dimensional scanning reference point arrangement is performed, 1.5m high on the side wall of the 1st to 3rd layers of cutting lanes, 1 laser reflection target is arranged every 5m, a total of 12, which are fixed by Φ16mm anchor rods, and the buried depth is 300mm.

[0066] The cutting engineering implementation is performed, and the specific implementation is as follows:

[0067] The cutting shaft is quickly formed by using a CMJ2-15 shaft drilling machine to drill a Φ670 mm vertical hole in the cutting roadway chamber with a depth of 25 m and a hole inclination error of less than or equal to 0.3°; after the construction is completed, the hole is covered with a Φ20 mm steel mesh at the hole opening and a same-specification mesh and anchor rod at the hole bottom with an interval of 500 mm for protection. Meanwhile, a YGZ-90 rock drilling jumbo is used to arrange 5 rows of Φ80 mm vertical holes around the large hole, a total of 24 holes, with a hole spacing of 0.7 m and a row spacing of 0.8 m, and a hole depth of 25 m.

[0068] Meanwhile, a JL3000 type pulse laser is used to scan the rock surface between the enlarged holes: the scanning path is annular around the large hole, each circle covers 3 enlarged holes, the scanning speed is 3 m / min, the spot diameter is 5 mm, and the single-point action time is 10 s; a continuous crack with a depth of 80 mm and a crack opening degree of 1-2 mm is formed.

[0069] The charging and blasting is performed: 4 cutting holes are used, Φ70 mm emulsion explosive is used, the charge is 1.2 kg / m, the whole hole is coupled, the hole bottom is reserved for 1.5 m, and the filling length is 0.8 m; 4 auxiliary holes are used, the charge is 1.0 kg / m, and the parameters are the same as above; 16 peripheral holes are used, the charge is 0.8 kg / m, and the filling length is 1.0 m; MS1 detonator is used for the cutting hole, MS3 detonator is used for the auxiliary hole, and MS12 detonator is used for the peripheral hole;

[0070] Specifically, the blasting effect is that the one-time well diameter is 2.5 m, the well wall flatness error is less than or equal to 200 mm, and there is no "perforation" phenomenon.

[0071] The cutting groove pulling groove process is performed, specifically as follows:

[0072] In the cutting crossheading, 11 rows of upward fan-shaped medium-length holes are constructed by using a CTJ10 type mining rock drilling jumbo, with a row spacing of 1.5 m, a hole bottom spacing of 0.8 m, and a hole depth of 8-15 m. A Φ75 mm PVC shaped charge tube is used, the shaped charge groove angle is 70°, which can adapt to a 65° ore body inclination, and the groove opening direction is towards the cutting shaft direction; a casing is used for connection between the tubes, and a gap between the casing and the hole wall is filled with Φ5 mm quartz sand.

[0073] Specifically, the blasting is implemented as follows: "small cutting" is first blasted for 1-3 rows, with a charge of 0.6 kg / m, and MS5 detonator is used; "large cutting" is then blasted for 4-11 rows, with a charge of 0.8 kg / m, and MS8-MS10 detonator is used; the cutting groove has a size of 12 m (length) x 5 m (width) x 25 m (height), the free surface flatness error is less than or equal to 0.5 m, and the rock block is uniform.

[0074] The cutting groove is quickly penetrated, and within 1 hour after the blasting, a Z+F IMAGER5010X scanner is used to scan the third layer cutting groove, with a scanning range of 20 m x 10 m x 10 m and a point cloud density of 100 points / mm 2;Scanning before cleaning the dust on the surface of the reflection target. And import Cyclone software, filter noise points with confidence <95%, generate a three-dimensional model; Calculate the average height difference between the top surface of the stockpile and the bottom plate of the second layer is 0.08m, and issue a stop mining instruction.

[0075] Among them, the first layer of positive row adopts directional blasting of shaped tube, and the second layer and the third layer follow in turn, forming a trapezoidal step. From the cutting of the shaft to the completion of the cutting groove blasting of the fourth layer, the whole process takes 5 days.

[0076] Finally, the recovery and filling process is carried out, taking the cutting groove as the free surface, the lateral caving ore, using ST-5B electric shovel to mine, and retaining 1 / 3 ore as temporary support. And after the end of the stope recovery, the tailings building waste cementing material is used, which is 30% tailings, 50% building waste and 20% cement, and the water-cement ratio is 1:10, as follows: first step filling 8m high, curing for 48 hours; the second step filling to 1m from the roof, curing for 72 hours; the final filling body strength is 3.5MPa, meeting the design requirements.

[0077] In summary, with the aid of the above technical solutions of the present application, the following effects can be achieved:

[0078] 1、The present application significantly improves the overall efficiency of underground mining by optimizing the depth of cutting and slotting process. In the cutting shaft forming stage, the introduction of laser pre-splitting assisted blasting technology not only reduces the integrity of the rock, makes the blasting energy more concentrated and accurate, effectively avoids the problems of "perforation" and "rock slag squeezing" in traditional process, but also reduces the charge quantity and reduces the disturbance of blasting vibration to surrounding rock, providing safer technical support for high stress ore body mining. The combination of directional fracture blasting and shaped tube ensures the regularity of the cutting groove free surface, making the rock breaking direction controllable in subsequent blasting, greatly reducing the secondary crushing workload, and improving the uniformity of ore lump size, creating favorable conditions for efficient ore mining. The application of three-dimensional laser scanning technology realizes the accurate monitoring of the height of the stockpile, replaces the traditional manual experience judgment, avoids the fluctuation of blasting effect caused by improper compensation space control, and ensures the stability and efficiency of the cutting groove penetration process.

[0079] 2、The application can be well adapted to different types of ore bodies and complex geological conditions. For non-standard ore bodies such as thin ore bodies and gently inclined ore bodies, by dynamically adjusting the stope structure parameters and slot hole network parameters, precise matching of cutting slots and ore body shape can be realized, which helps to improve resource recovery rate; in complex geological areas such as faults and aquifers, through supporting measures such as pre-reinforcement and advanced treatment, the construction risk can be effectively reduced, and the process continuity can be ensured. At the same time, the whole process system reduces the dependence on high-risk manual operation, through the cooperation of intelligent monitoring and automatic equipment, the underground operation environment is improved, and the labor intensity is reduced. In addition, the resource utilization of tailings and other solid wastes in the filling process not only reduces waste emissions, but also reduces the cost of filling materials, realizes the unity of economic benefits and environmental benefits, and provides strong support for the sustainable development of mines.

[0080] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Those skilled in the art will easily think of other embodiments of the present disclosure after considering the disclosure in the specification and examples. The present application is intended to cover any variations, uses or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or conventional techniques in the technical field that are not disclosed by the present disclosure. The specification and examples are only considered as exemplary, and the true scope and spirit of the present disclosure are indicated by the claims.

[0081] It should be understood that the present disclosure is not limited to the precise structures already described and shown in the drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A backfill mining method based on the stage reverse medium-length hole slotting, characterized in that, The method comprises the following steps: The method comprises the following steps: The cutting engineering comprises the following steps: The cutting engineering comprises the following steps: The cutting engineering comprises the following steps: The cutting engineering comprises the following steps:

2. The stage reverse medium-length hole slot-based filling mining method according to claim 1, characterized in that, The cutting engineering comprises the following steps:

3. The mining method based on the stage reverse medium-length hole slot filling according to claim 1, characterized in that, The cutting engineering comprises the following steps:

4. The mining method based on the stage reverse medium-length hole slot filling according to claim 1, characterized in that, The cutting engineering comprises the following steps: The cutting engineering comprises the following steps: The cutting engineering comprises the following steps: The cutting engineering comprises the following steps: The cutting engineering comprises the following steps:

5. The stage reverse medium-length hole slot-based filling mining method according to claim 4, characterized in that, The cutting engineering comprises the following steps: The cutting engineering comprises the following steps: The cutting engineering comprises the following steps: The cutting engineering comprises the following steps: The cutting engineering comprises the following steps:

6. The stage reverse medium-length hole slot-based filling mining method according to claim 5, characterized in that, The cutting engineering comprises the following steps: The third layer cutting groove is scanned by a three-dimensional laser scanner within 1 hour after blasting, and the point cloud density is 100 points / mm 2 ; The cutting engineering comprises the following steps: The cutting engineering comprises the following steps: The cutting engineering comprises the following steps:

7. The stage reverse medium-length hole slot-based filling mining method according to claim 1, characterized in that, The cutting engineering comprises the following steps:

8. 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